I recovered a QNAP NAS for a client, with 4 SSD drives inside. The NAS stopped working at some point. When I got the drives, 1 out of 4 had BS, another had an unstable reading. I imagined them all into bin files using pc3000. To assemble the RAID5, I used UFS explorer. All went smoothly, copied out all the files, with one problem - apparently, the versions of the files are old. The client used the NAS in 2020, and all I get are the same files but from late 2019.
I tried assembling the raid without one of the drives each time, thinking that maybe one of them stopped working at some point, and if it's part of the raid it will show me old versions. It didn't work, every time I get the same, older versions of files. I can't find any other backup folder.

Any ideas where do I look next? Thank you

1) Make comparing all 4 constrction to each others. This way you can find a "culprit"
2) I case if there is couple of "culprit" drives (working/stop working periodically in different timeframes) you need to create custom build.
3) There is a chance you did clonning one of those bad ssd disks with old thanslator version.

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Angel Data Recovery

He rebuilt the RAID with missing drives, so I don't think that is his issue?
Maybe the BS hiding parts of the MFT?
Did you scan the full volume before saving the files?

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HDD, SSD, Flash and RAID Data Recovery
Founder of The Data Recovery Professionals Group